^是次方号
(1) b(a+b)^2-2(a+b)
(2) a(x-5)+b(5-x)-c(5-x)
(3) -6(x-y)^3-3y(y-x)^3
(4) 2a(x+y-z)-3b(x+y-z)-5c(x+y-z)
參考答案:(1) b(a+b)^2-2(a+b)
=(a+b)(ab+b^2-2)
(2) a(x-5)+b(5-x)-c(5-x)
=a(x-5)-b(x-5)+c(x-5)
=(x-5)(a-b+c)
(3) -6(x-y)^3-3y(y-x)^3
=6(y-x)^3-3y(y-x)^3
=3(y-x)^3(2-y)
(4) 2a(x+y-z)-3b(x+y-z)-5c(x+y-z)
=(x+y-z)(2a-3b-5c)
参考资料：^-^ 是这样吗？